Micro-SD Specification
2F.No2.Shangsha Industral.FuTian
District ShenZhen City China
深圳市福田区上沙高新科技园 2 栋 2 楼
Tel +86 755 83896667 83896577
Fax +86 755 83896109
Micro-SD card specification
Proprietary&Confidential
Copyright 2006
Contents
A. General Description............................................................................... 1
B. Features..................................................................................................2
C. Pin Assignment...................................................................................... 3
D. Hardware Interface................................................................................. 5
E. System Power Consumption ................................................................ 6
F. Electrical Specifications........................................................................ 6
G. DC Characteristic................................................................................... 7
H.AC
Characteristic...................................................................................
8
H1. Micro SD Interface timing (Default) ......................................................... 8
H2. Micro SD Interface timing (High-speed Mode) ................................... 10
I. Physical Outline Dimension................................................................... 11
A. General Description
The Micro Secure Digital (Micro-SD) card is fully compliant to the SD Memory Card
Specification version 1.1 (backward compatible with 1.01). It provides the highest level
of performance for Micro-SD supported consumer electronic devices. Micro-SD card is
capable for storing up to 512MB of data.
The Micro-SD card is based on an advanced 8-pin interface, designed to operate at a
maximum operating frequency of 50MHz and a low voltage range from 2.7V to 3.6V. It
can alternate communication protocol between SD mode or SPI mode. It performs data
error detection and correction with very low power consumption.
Micro Secure Digital card is one of the most popular cards today based on its high
performance, good reliability and wide compatibility.
B. Features
Support SD system specification version 1.1
Support Capacity : 16MB / 32MB / 64MB / 128MB / 256MB / 512MB
Voltage range : Basic communication (CMD0, CMD15, CMD55, ACMD41) : 2.0 - 3.6V.
Other command and memory access : 2.7 - 3.6V.
Designed for read-only and read/write cards.
Default mode : Variable clock rate 0-25MHz, up to 12.5MB/sec interface speed(using
4 parallel data lines)
High-Speed mode : Variable clock rate 0-50MHz, up to 25MB/sec interface
speed(using 4 parallel data lines)
Switch function command supports High-Speed.
Copyrights Protection Mechanism - Complies with highest security of SDMI standard.
Password Protection of cards (option).
Write Protect feature using mechanical switch.
Built-in write protection features (permanent and temporary).
Support SD SPI mode
High transmission speed (refer to speed test section) +4KV/-4KV ESD protection in
contact pads.
Dimension : 15mm(L) x 11mm(W) x 1mm(H)
C. Pin Assignment
SD Mode
pin
SPI Mode
Name
Type1
Description
Name
1
DAT2
I/O/PP
Data Line[bit2]
RSV
2
CD/DAT3 2
I/O/PP 3
Card Detect/ Data
Line[bit3]
3
CMD
PP
4
VDD
5
Type
Description
CS
I3
Chip Select (neg
true)
Command/Response
DI
I
Data In
S
Supply voltage
VDD
S
Supply voltage
CLK
I
Clock
SCLK
I
Clock
6
VSS
S
Supply voltage
ground
VSS
S
Supply voltage
ground
7
DAT0
I/O/PP
Data Line[bit0]
DO
O/PP
Data Out
8
DAT1
I/O/PP
Data Line[bit1]
RSV
-
(1)
S: power supply, I:input; O:output using push-pull drivers; PP:I/O using push-pull drivers
(2)
The extended DAT lines(DAT1-DAT3)are input on power up. They start to operate as DAT lines
after SET_BUS_WIDTH command. The Host shall keep its own DAT1-DAT3 lines in input mode, as well, while
they are not used. It is defined so, in order to keep compatibility to MultiMedia Cards.
(3)
At power up this line has a 50KOhm pull up enabled in the card. This resistor serves two
functions Card detection and Mode Selection. For Mode Selection, the host can drive the line high or let it be
pulled high to select SD mode. If the host wants to select SPI mode it should drive the line low. For Card
detection, the host detects that the line is pulled high. This pull-up should be disconnected by the user, during
regular data transfer , with SET_CLR_CARD_DETECT(ACMD42) command.
Name
Width
Description
CID
128bit
Card identification number; card individual number for identification.
Mandatory
RCA
16bit
Relative card address; local system address of a card, dynamically suggested
by the card and approved by the host during initialization. Mandatory
DSR
16bit
Driver Stage Register; to configure the card’s output drivers. Optioanal
CSD
128bit
Card Specific Data; information about the card operation conditions.
Mandatory
SDR
64bit
SD Configuration Register; information about the Micro SD Memory Card’s
Special Features capabilities. Mandatory
OCR
32bit
Operation condition register. Mandatory
D. Hardware Interface
The SD Memory Card has six communication lines and three supply lines:
• CMD:
• DAT0-3:
Command is a bidirectional signal. The host and card drivers are
operating in push pull mode.
Data lines are bidirectional signals. Host and card drivers are
operating
in push pull mode
• CLK:
Clock is a host to card signal. CLK operates in push pull mode.
• VDD:
VDD is the power supply line for all cards.
• VSS:
Ground lines.
Bus circuitry diagram
E. System Power Consumption
Table list as below is the power consumption of Micro SD card with the flash memory.
(PS4043 + Flash Memory)
Flash mode
Max Power up
Current (uA)
Max Stand by
Current (uA)
Max Read
Current (mA)
Max Write
Current (mA)
Single(1)
flash(1x8bit)
150
150
60@ 3.6V
60@ 3.6V
Parallel(2)
flash(2x8bit)
200
200
80@ 3.6V
80@ 3.6V
(1) Data transfer mode is single channel.
(2) Data transfer mode is dual channel.
F. Electrical Specifications
Absolute Maximum Rating
Item
Symbol
Parameter
MIN
MAX
Unit
1
VDD-VSS
DC Power Supply
-0.3
+3.3
V
2
VIN
Input Voltage
VSS-0.3
3
Ta
Operating Temperature
-25
+85
℃
4
Tst
Storage Temperature
-40
+85
℃
Parameter
VDD+0.3
V
Symbol
Min
MAX
Unit
Operating
Temperature
Ta
-25
+85
℃
VDD Voltage
VDD
2.0
3.6
V
G. DC Characteristic
Micro SD Controller DC Characteristics
Parameter
Symbol
Peak voltage on all lines
Min
Max.
Unit
-0.3
VDD+0.3
V
-10
10
uA
-10
10
uA
All Inputs
Input Leakage Current
All Outputs
Output Leakage Current
Output High Voltage
VOH
Output Low Voltage
VOL
Input High Voltage
VIH
Input Low Voltage
VIL
0.75*VDD
V
0.125*VDD
V
0.625*VDD
VDD+0.3
V
VSS-0.3
0.25*VDD
V
IOH=-100uA
@VDD Min
IOL=100uA
@VDD Min
Bus Signal Levels
Bus signal levels
• Power Supply Voltage
Parameter
Supply voltage
Supply voltage
differentials(Vss1,Vss2)
Power up time
symbol
Min
Max
Unit
VDD
2.0
3.6
V
-0.3
0.3
V
250
mS
from 0v to VDDMin.
• Bus Signal Line Load
Parameter
Pull-up resistance for CMD
symbol
RCMD
RDAT
Min
Max
Unit
Remark
10
100
K omh
to prevent bus floating
Bus signal line capacitance
CL
250
pF
fpp<5 MHz, 21 cards
Bus signal line capacitance
CL
100
pF
fpp<20 MHz, 7 cards
Single card capacitance
CCARD
10
pF
16
nH
90
K omh
Maximum signal line inductance
Pull-up resistance inside card
RDAT3
10
H. AC Characteristic
H1. Micro SD Interface timing (Default)
fpp<20 MHz
May be used for card detection
Parameter
Symbol Min
Max.
Unit
Clock CLK (All values are referred to min(VIH) and max(VIL)
Clock frequency Data Transfer
fPP
0
25
MHz
Mode
Clock frequency Identification
400
Mode(the low freq. is required for
fOD
0
KHz
0(1)/100KHz
MultiMedia Card compatibility)
Clock low time
tWL
10
ns
Clock high time
tWH
10
ns
Clock rise time
tTLH
10
ns
Clock fall time
tTHL
10
ns
Clock low time
tWL
50
ns
Clock high time
tWH
50
ns
Clock rise time
tTLH
50
ns
Clock fall time
tTHL
50
ns
Remark
CL≤100 pF
(7 cards)
CL≤250 pF
(21 cards)
CL≤100 pF
(7 cards)
CL≤100 pF
(7 cards)
CL≤100 pF
(7 cards)
CL≤100 pF
(7 cards)
CL≤250 pF
(21 cards)
CL≤250 pF
(21 cards)
CL≤250 pF
(21 cards)
CL≤250 pF
(21 cards)
Inputs CMD, DAT (referenced to CLK)
Input set-up time
tISU
5
ns
Input hold time
tIH
5
ns
CL≤25 pF (1
cards)
CL≤25 pF (1
cards)
Outputs CMD, DAT (referenced to CLK)
Output Delay time
tODLY
0
14
ns
CL≤25 pF (1
cards)
(1) 0Hz means to stop the clock. The given minimum frequency range is for cases were
continues clock is required.
H2. Micro SD Interface timing (High-speed Mode)
Parameter
Symbol Min
Max.
Unit
Clock CLK (All values are referred to min(VIH) and max(VIL)
Clock frequency Data Transfer
fPP
0
50
MHz
Mode
Clock low time
7
ns
tWL
Clock high time
7
ns
tWH
Clock rise time
3
ns
tTLH
Clock fall time
tTHL
3
ns
Inputs CMD, DAT (referenced to CLK)
Input set-up time
6
ns
tISU
Input hold time
2
ns
tIH
Outputs CMD, DAT (referenced to CLK)
Output Delay time
0
14
ns
tODLY
Output Hold time
2.5
ns
tOH
Total System Capacitance for
CL
40
pF
each line1
(1) In order to satify severe timing, host shall drive only one card.
Remark
I. Physical Outline Dimension